Screw insulator



Nov. 19, 1929. w. D. KYLE SCREW INSULATOR Filed Nov. 21, 1924 WITNESSES A TTORNEY.

. view of the insulator of Fig 1, showing the Patented Nov. 19,1929

UNITED STATES PATENT OFFICE.

WILLIAM J). KYLE, OF MILWAUKEE, WISCONSIN, ASSIGNOR, BY MESNE ASSIGNMENTS,

TO LINE MATERIAL COMPANY, OF SOUTH MILWAUKEE, WISCONSIN, A CORPORA- TION OF DELAWARE SCREW msULA'roa Application filed November 21, 1924. Serial No. 751,253.

The invention relates to insulators and its object is to provide an insulator having an attaching screw disposed in relatively nonerotatable engagement with the walls of a retaining aperture therein, and having a transverse opening therethrough to receive a bar tool, whereby the attaching screw may be rotated by a turning tool passing through the transverse opening.

Another object of the invention is to provide an insulator of this character in which the screw-receiving aperture extends axially through the insulator body and is intercepted by the transverse opening, whereby the turning tool is adapted to bear on the head of the screw to retain it in place in the aperture and to transmit an axial thrust thereon when turning it into a support.

The invention further consists in the several features hereinafter set forth and more particularly defined by the annexed claims.

In the accompanying drawings, Fig. 1 is a side View of an insulator embodying the in vention attached to a support;

, Fig. 2 is a vertical longitudinal sectional view through the insulator of Fig. 1';

Fig. 3 is a rear end View of the insulator; Fig. 4 is a horizontal longitudinal sectional manner of attaching it to a support;

Fig. 5 is'a similar view showing a modified form of insulator and attaching screw and I Fig. 6 is a rear end view of the insulator in Fig. 5.

In these drawings, designates the insulator body of Figs. 1 to 4 inclusive, while 25 designates the insulatorbody of'Figs. 5 and 6. In each instance, the insulator body is provided with a transverse opening 26 adapted o receive a wire therethrough and also preferably a wire-receiving groove 27 ,which extends around the head of the insulator body in an axial plane and merges with the opening 26 at its ends. In some instances a circumferential wire-receiving groove 28 may also be formed about the insulator.

An axial opening-extends through the insulator bodies in Figs. 1 to 6, and in Figs. 1 to 4 this opening comprises a circular bore 29 extending into the head of the insulator and intercepting the transverse opening 26, and a reduced opening 30 of square or polygonal cross sect-ion extending inwardly from the rear flat face 31 of the insulator body to meet the circular bore 29, a shoulder 32 being formed at their junction.

An attaching screw 33 is adapted to be inserted into the axial opening of the insulator body from the front and is provided with a square or polygonal shank portion 34 adapted to enter and fit loosely within thereduced polygonal opening 30 in the insulator body to afford a driving engagement therewith, the head 35 of the screw being adapted to seat against the shoulder 32. The attaching screw is preferably in the form of a' lag screw for mounting the insulator on a wooden support, but it may be in the form of a machine screw for mounting it on a metal support.

In the form of insulator shown in Figs. 5 and 6, the attaching screw 33 is in the form of an ordinary lag screw having a square head 35 adapted to fit loosely in driving engagement with the walls of an axially disposed opening 29 of square cross section extending lnwardly from the head of the insulator, while the round shank of the screw passes through a reduced bore 30' which forms a shoulder 32 against which the head of the screw is adapted to seat.

The drivingengagement of the attaching screw with the walls of the screw-receiving opening in the insulator body permits the screw to be turned into a support 36 by turning the insulator body, and this is arcomplished by inserting a turning bar 37 through the transverse opening 26 in the insulator body to affordv a handhold, preferably at both sides of the insulator. The turning bar will retain the head of the attaching screw in a limited space for preserving the driving engagement'between the screw and the insulator and will afford means for transmitting to the screw the axial thrust necessary when it "enters a support 36. When the rear face 31 of the insulator body reaches the support 36 to stop its axial movement, the attaching screw continues to advance into the support until its head engages the shoulder in the screwreceiving opening and clamps the insulator i 7-1 may receive a tie-wire extending around the i body firmly against the support. In each instance the fit of the attaching screw in the insulator body is somewhat loose so that the ingroove 27 in the head, or the line wire may be by Letters Patent is:

held in the groove 27 by the tie-wire passing through the opening 26. The wire may also be secured in the circumferential groove 28 by a tie-wire passing around the insulator.

The insulator of this invention is mounted by turning the insulator body which is in driving engagement with the head or shank of an attaching screw. For this purpose, the turning bar 37 is inserted through the transverse opening 26 and preferably extends from each side to afford handholds, whereby an axial thrust may be transmitted to the insulator for eifectingthe entrance of the screw into the support. The mounting of the insulator is readily accomplished withoutinjury to the insulating material and the character of the assembly of parts avoids the necessity for embedding the screw in theinsulator body;

What I claim as new and desire to secure 1. An insulator comprising an insulator body having a transverse wire-receiving opening and a shouldered screw-receiving aperturei'ntercepted by said opening, an attaching screw having an enlarged head portion inserted in said aperture in. axially spaced relation from said transverse opening to. engage the shouldered portion of said aperture and said screw being in relatively non-rotatable loosely fitting engagement with the walls of said aperture, whereby said attaching screw may be turned into a support and receive an axial'thrust by a tool inserted through said transverse opening.

, 2. An insulator comprising an insulator "body having a transverse wire-receiving ropeningand-an axially disposed shouldered screw-receiving aperture extending through said insulator body and intercepted by said transverse opening, and an attaching screw loosely lnserted in said aperture in relatively non-rotatable engagement with the walls of saidaperture and having a clamping head disposed within said aperture between said transverse opening and the shouldered portion of said aperture .to permit a ,tool to be inserted through said transverse opening in v shank-receiving portion, and an attaching the insulator body, whereby said attaching screw may be turned into a support by turning the insulator body, said screw head being adapted to receive an axial thrust transmit-' ted by its engagementwith said tool.

8. An insulator comprising an insulator body having a transverse wire-receiving opening and an axial screw-receiving aperture extending through said insulator body, said a perture including a polygonal portion intercepted by said transverse opening and a reduced cylindrical portion spaced from said transverse opening and forming a shoulder with said polygonal portion, and an attaching screw loosely inserted in said aperture and having a polygonal head between said transverse o ening and said shoulder to fit the walls of sai aperture adjacent said shoulder whereby said attaching screw may be turned into a support by a tool inserted through said transverse opening, said tool being adapted to transmit an axial thrust by its engagement with the head-of said screw for effecting its entrance into said support.

4. An insulator comprising an insulator body having a transverse opening and a longitudinally disposed shouldered screw-receiving. aperture intercepting said transverse opening, and an attaching screw loosely inserted in said aperture in driving engagement with the walls thereof and having a head adapted to engage the shouldered portion of said aperture, the transverse opening in the insulator body being adapted to receive a turning tool for screwing said attaching screw into asupport and for confining the head of the attaching screw within said aperture between said tool and the shouldered portion of said aperture during the driving operatlOIl.

5. In combination, an insulator body having a transverse opening and a screw-headreceiving aperture intercepting said transverse opening, said aperture extending into the base portion of the body beyond the trans- 11o verse opening and havinga reduced screwscrew loosely inserted in said aperture in driving engagement with the walls thereof and having a head portion within said aperture, said transverse opening being adapted to receive a turning tool to confine said sorewhead portion within said aperture during the driving operation and to transmit axial thrust on said screw during said operation.

In testimony whereof I affix my signature.

WILLI'AM D. KYLE. 

